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Thread: Rear ring on 18-70

  1. #1

    Default Rear ring on 18-70

    Hello guys, juz bought a 2nd hand 18-70mm. How and when do we use the rear focus ring? Seems confused.

  2. #2

    Default Re: Rear ring on 18-70

    For.. manual focusing?
    Meow!

  3. #3

    Default Re: Rear ring on 18-70

    U mean when lens in autofocus mode, we do not need to use the rear focus ring? Only in manual mode? There are some distance markings on the rear ring.

  4. #4

    Default Re: Rear ring on 18-70

    Quote Originally Posted by mutant View Post
    U mean when lens in autofocus mode, we do not need to use the rear focus ring? Only in manual mode? There are some distance markings on the rear ring.
    Not sure about this particular lens, but in most lenses, a focus ring does just that - it allow for manual focus.
    Meow!

  5. #5
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    Default Re: Rear ring on 18-70

    Quote Originally Posted by mutant View Post
    U mean when lens in autofocus mode, we do not need to use the rear focus ring? Only in manual mode? There are some distance markings on the rear ring.
    Um. Yeah. Why would you, under normal circumstances, want to also be manual focusing if the camera is doing it for you already?

    Those markings, by the way, are focus distance marks.

  6. #6
    Moderator catchlights's Avatar
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    Default Re: Rear ring on 18-70

    Quote Originally Posted by mutant View Post
    Hello guys, juz bought a 2nd hand 18-70mm. How and when do we use the rear focus ring? Seems confused.
    there is no front or real focusing ring on a 18~70mm lens.

    There is only ONE focal/zoom ring, and ONE focus ring.

    To use focal/zoom ring, use your fingers, hold the focal/zoom ring and turn, you able to change the focal length of the lens.

    To use focus ring, use your fingers, hold the focus ring and turn, you able to change the focusing of the lens, you view thru the viewfinder, to see the image get into focus.

    For more detail instruction, please read your camera, and lens user manual.

    hope this help.
    Last edited by catchlights; 3rd October 2008 at 12:27 PM.
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  7. #7
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    Default Re: Rear ring on 18-70

    Quote Originally Posted by catchlights View Post
    there is no front or real focusing ring on a 18~70mm lens.

    There is only ONE focal ring, and ONE focus ring.

    To use focal ring, use your fingers, hold the focal ring and turn, you able to change the focal length of the lens.

    To use focal ring, use your fingers, hold the focus ring and turn, you able to change the focusing of the lens, you view thru the viewfinder, to see the image get into focus.

    For more detail instruction, please read your camera, and lens user manual.

    hope this help.
    Eh why you go and confuse people...just say zoom ring lah!

    Btw, you gave instructions for focal (zoom) ring twice.

  8. #8
    Moderator catchlights's Avatar
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    Default Re: Rear ring on 18-70

    Quote Originally Posted by calebk View Post
    Eh why you go and confuse people...just say zoom ring lah!

    Btw, you gave instructions for focal (zoom) ring twice.
    I check the camera manual, they call it focal ring, check the lens manual, it call zoom ring here.....

    paisah, cut and paste one lah.....
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  9. #9

    Default Re: Rear ring on 18-70

    I do not have the lens manual. Have figured out on how to use it. Thanks for the advices.

  10. #10

    Default Re: Rear ring on 18-70

    The 18-70 should allow manual focus override.This means that you can manual focus even if the camera is on AF mode.This will help you if AF is hunting...Which usually does not happen with a >F2.8 lens.

  11. #11
    Member gymak90's Avatar
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    Default Re: Rear ring on 18-70

    Quote Originally Posted by nikonshutter View Post
    The 18-70 should allow manual focus override.This means that you can manual focus even if the camera is on AF mode.This will help you if AF is hunting...Which usually does not happen with a >F2.8 lens.
    Not true.
    Hunting occurs because it is dependent on the subject you trying to focus. For e.g. lighting conditions, colour/constrast, lines, subject size etc. In other words, it is your camera's AF drive that is fooled.

    Go take 50 f1.8 or 70-200 f2.8, try focusing on a dark object. Or a carpet of continuous colour. Or focus through a fence. Or when your subject takes a small proportion of your frame. I bet you hunting will happen.
    Last edited by gymak90; 4th October 2008 at 06:54 PM.
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